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Po674 glow plug control ciriut problem replaced glow plug but still comes back

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Posted on Jan 02, 2017

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SOURCE: peugeot partner wopnt start replaced glow plug

what voltage u getting ?. did it just stop and then not restart. if its getting fuel and glow plugs are working the next two items id look at is the cam shaft and crank shaft position sencors. also make sure ur battery is in good condition, so starter motor is turning fast enough to build up the correct pressure on the rail.

Posted on Dec 14, 2009

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SOURCE: glow plug #4 cyl trouble code po674

Most likely you have a dread plug. Remove it and test it by using a jumper wire from bat. + to the plug harness tip and ground the plug body to the bat - or engine ground. If it does not start to glow, replace.

If you are not comfortable doing this, swap the #4 plug with one of the others and see if the code changes.

Posted on Dec 08, 2010

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SOURCE: Codes PO672, PO673 & PO674. Where are these


The glow plugs are plugged into the cylinders. They basically do the same that spark plugs do in gasoline/petrol fueled engines.

It is quite rare that glow plugs heater circuits go bad all at once. Test also the wiring harness.

Here a forum that can help you a lot. Picture below is from the forum in this link:


Posted on Feb 06, 2011

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1992 Ford F350 7.3 Diesel, put in glow plug controller, controller clicks off and on but no power to glow plugs.

Maybe you got a bad glow plug controller ! Did you use a aftermarket part or OEM replacement ?

Dec 31, 2016 | 1992 Ford F350

1 Answer

Code po670 what does it mean

- P0670 states there is a problem with the glow plug control module or glow plug(s)
- P0670 Glow Plug Mod Control Circuit
- Standard DTCs (ISO 15031-6/SAE J2012): Glow Plug Control Module Control Circuit/Open

Read more:

May 30, 2014 | 2008 Mercedes-Benz Mercedes Benz Ml Class

1 Answer

Colt diesel takes a long time to start. glow plugs and battery are new. some one suggested glowplug relays or the black box. what can i do to check if its any of the two or what do you recommend i do

if the ignition controls the amount of time glow plugs are on for flick the ignition off and on 3-5 times each time letting the glow plug symbol glow untill it turns off then try starting. if its still slow to fire your glow plugs are not working at all. start by backtracing the glow plugs from the adjoining bar back to wherever it comes from for breaks, then replace your glow plug relay in the fuse box usually.

if its manual glowing just glow it for 10-12 seconds and try.if its not firing then the glows arent getting the power they need

Feb 14, 2014 | Mitsubishi Colt Cars & Trucks

1 Answer

Codes PO672, PO673 & PO674. Where are these glow plugs located?


The glow plugs are plugged into the cylinders. They basically do the same that spark plugs do in gasoline/petrol fueled engines.

It is quite rare that glow plugs heater circuits go bad all at once. Test also the wiring harness.

Here a forum that can help you a lot. Picture below is from the forum in this link:


Feb 06, 2011 | 2002 Volkswagen Jetta TDI

2 Answers

Glow plugs stopped working on a pajero 2.8td 1994 model, plugs and buzz bar are ok.

My glow rail would come on for a very short time, then turn off (less than 1 second).
Replaced the control wire for the glow relay, with a test lead from battery to relay control terminal - relay was working fine (relay is between batteries).

Checked the engine temperature sensor (located on top of the housing where the top radiator hose attaches to the engine).
Take out and test in a pot of water (need a 19mm deep socket to remove).
At 0 deg C should be 8.6K ohms
At 20 deg C should be 3.25K ohms
At 40 deg C should be 1.5 K ohms
At 80 deg C should be 300 ohms
I replaced the temperature sensor with a 8.2K ohm resistor (engine cold).
Then tried with a 1.2K ohm resistor (engine hot).
Each time I tested the glow rail at the relay (with a multimeter) it would turn off after about 12-14 seconds, which is normal, to protect the glow plugs and battery drain (they come on again when engine is starting).

When I put the temperature sensor back in, the glow rail was working fine again - only thing I can think of is that the contact between the sensor and the plug, may have had a oxide formed and caused a high resistance or open circuit, indicating to the glow controller that the engine was hot and did not need glow activation.
So try taking the plug off the temperature sensor, and reattaching it again it might be all it needs, to clean its contacts.

Feb 01, 2010 | 1994 Mitsubishi Montero

3 Answers

Wait to start light doesn't come on on my 1999 ram diesel it starsts a little hard on cold mornings

The Cummins does not have glow plugs as mentioned above. It has intake heaters. I have a 99 also and it is a cold natured girl on a cold morning. You should have a block heater to plug in when it is below 40 F. The electric plug should be on the passenger side just inside grill on the hood. You can plug it in all night or a couple of hours before you are ready to go and it should help. Also, since your wait to start light is not working, the intake heaters may not be working. Check them out.

Nov 10, 2009 | 1999 Dodge Ram 2500 4WD

1 Answer

My 2004 f250 after it sits it wont start. the wait to start light only comes on for bout1 to 2 sec. the only way i start it is to plug it up at night what is my problem.

The wait to start light always comes on for at least 1 sec, if it goes off early it must think the engine is warm.

My guess is you have a faulty engine oil temp sensor that is telling the pcm that it is already warm. The only way to know for sure is to read the info with a scan tool.

Glow Plug System: Description and Operation
The 6.0L diesel engine uses a glow plug system that preheats air in the combustion chamber to improve cold engine starting.
The system consists of:
- glow plugs.
- glow plug control module.
- powertrain control module (PCM).
- engine oil temperature (EOT) sensor.
- barometric pressure sensor (BARO sensor).
The glow plug monitor system is part of the On-Board Diagnostics II (OBD II) System.
The glow plug system is electronically controlled by the powertrain control module. If the oil temperature is below 55°C (131°F) the powertrain
control module will energize the glow plugs immediately after the key is placed in the ON position. Then, depending on the readings from the engine
oil temperature (EOT) sensor and the barometric pressure (BARO) sensor, the powertrain control module determines how long the glow plugs will be
The glow plugs are located in the cylinder heads, under the glow plug buss bar.
The glow plugs are self-regulating. If the engine oil temperature is above 55°C (131°F), the powertrain control module will bulb-check the WAIT TO
START lamp but not energize the glow plug relay.
The glow plug ON time varies from 0-120 seconds depending on battery voltage, engine oil temperature and barometric pressure.
The glow plug control monitor (GPCM) system is designed to find failed glow plugs or failed wiring in the glow plug system.

Oct 30, 2009 | 2004 Ford F250

1 Answer

2007 sprinter trouble code po674?

0675 is a fault in glow plug # 5 .I dont see a 674 in my list , but I got it off the web and my not be complete. and its for 08 dzl

Aug 10, 2009 | 2007 Dodge Sprinter

1 Answer

1982 6.2 glow plugs will not turn off

This sounds to me like you may have a Glow Plug Controller issue. If the glow plugs come on and cycle but do not shut off the Control Module may be faulty, my suggestion would be to replace the Controller ( if you haven't already tried that) and possibly replace your glow plugs as well. Hope this helps.

Mar 09, 2009 | 1983 Chevrolet C2500

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